<template>
<div class="list" ref="wrapper">
    <div>
    <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
            <div class="button-wrapper">
                <div class="button">{{this.currentCity}}</div>
                </div>
        </div>
    </div>
    <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
            <div class="button-wrapper" 
            v-for="item of hot" 
            :key="item.id"
            @click="handleCityClick(item.name)"
            >
                <div class="button">{{item.name}}</div>
                </div>
        </div>
    </div>
    <div class="area" 
    v-for="(item,key) of cities" 
    :key="key"
    :ref="key"
    >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
            <div
            class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
            >
            {{innerItem.name}}
            </div>
        </div>
    </div>
    </div>
</div>
</template>

<script>
import BScroll from 'better-scroll'
import {mapState, mapMutations} from 'vuex'
export default {
    name:'CityList',
    props:{
        hot: Array,
        cities: Object,
        letter: String
    },
    computed: {
        ...mapState({
            currentCity: 'city'
        })
    },
    methods: {
        handleCityClick(city){
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations([
            'changeCity'
        ])
    },
    mounted(){
        this.scroll = new BScroll(this.$refs.wrapper)
    },
    updated () {
         this.scroll.refresh()
            },
  
    watch: {
        letter (){
            if(this.letter){
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    }
}
</script>

<style lang='stylus' scoped>
@import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color :#ccc
        &after 
            border-color :#ccc
    .border-topbottom
        &:before
            border-color :#ccc
    .list
        overflow :hidden
        position :absolute
        top :1.58rem
        left :0
        right :0
        bottom :0
        .title
            line-height :.54rem
            background :#eee
            padding-left :.2rem
            color :#666
            font-size :.26rem
        .button-list
            overflow :hidden
            padding :.1rem .6rem .1rem .1rem
            .button-wrapper
                float :left
                width :33.33%
                .button
                    margin :.1rem
                    padding :.1rem 0
                    text-align :center
                    border: .02rem solid #ccc
                    border-radius :.06rem
        .item-list
            .item
                line-height :.76rem
                color :#666
                padding-left :.2rem
</style>